how can I remove part of data from state in react.js - reactjs

Question

I create and add some data to my selecetFile2 state / then I want to delete some part of that selecetFile2 state by any event- just guide for function.
const [selectedFile2, setSelectedFile2] = useState([]); //my state for data
const [isFilePicked2, setIsFilePicked2] = useState(false); //just controll for page
this function for control data
const changeHandler2 = (event) => {
setSelectedFile2([...selectedFile2,event.target.files[0]]);
setIsFilePicked(true);}
const multi_img = ()=>{ //It's for input dialog box
document.getElementById("multi_img").click();}
this my main code
<input type="file" onChange={changeHandler2} title="ali ali" id="multi_img"
name="img" accept="image/*" style={{display:'none'}} />
<div><BsFillPlusSquareFill onClick={multi_img} /> //input control by this
{
isFilePicked2 &&
selectedFile2.map(item => <img key={v4()} src={URL.createObjectURL(item)} />)
//this my Item I want to delete for example by click
//I just need function
}

Answer 1

Here you go
<input
type="file"
onChange={changeHandler2}
title="ali ali"
id="multi_img"
name="img"
accept="image/*"
style={{ display: "none" }}
/>
<div>
<BsFillPlusSquareFill onClick={multi_img} /> //input control by this
{
isFilePicked2 &&
selectedFile2.map((item) => (
<img key={v4()} src={URL.createObjectURL(item)} onClick={ () => {
setSelectedFile2(selectedFile2.filter(i => i !== item))
}} />
))
//this my Item I want to delete for example by click
//I just need function
}
</div>

Answer 2

By using useState, you can not directly update or modify the state. Whenever you wanted to modify or update the state you have to do it using the set[nameofstate]. In your case.
whenever you want to update selectedFile2 you have to pass the new value for seletedFile2 to setSelectedFile2(newValueForSelectedFile2).
for more information and examples please visit documenation